xp printer problems

Has anyone had this problem crop up. On my home network I have 2 xp pro machines one 2000 pro and a 98 machine. One of the xp machines has both printers hooked up. Until I downloaded sp2 there was no problem accessing the printers from any machine. Now I have to go to my network neighborhood and log onto the xp machine that serves as a print server to print from the other machines. I realize this improves security. I just don't understand whether this change came from sp2 or after my recent upgrade of my black ice firewall.